Abstract
Lithium ion (Li-ion) batteries have been widely used in various kinds of applications, including consumer electronics, green energy systems and electrical vehicles. Since the charging method has a significant influence on the performance and lifetime of Li-ion batteries, an intelligent charging algorithm which can properly determine the charging current is essential. In this study, a fuzzy-logic-control-based (FLC-based) five-stage Li-ion battery charger is proposed. The proposed charger takes the temperature rise and the gradient of temperature rise of battery into account, and adjusts the charging current accordingly. To further improve the performance of the proposed FLC, the fuzzy-based Taguchi method is utilized to determine the optimal output membership functions (MFs). Comparing with the conventional constant current-constant voltage (CC-CV) method, the charging time, charging efficiency, average temperature rise and the obtained cycle life of the Li-ion battery are improved by about 58.3%, 1.65%, 26.7% and 59.3%, respectively.
Highlights
Secondary batteries are commonly utilized as energy storage solutions for modern technologies such as portable devices, renewable energy systems and electric vehicles
Since the aim of this study is to develop an intelligent charger with short charging time, high charging efficiency and low temperature increment; the optimization can be regarded as a multiple performance characteristic index (MPCI)
Since larger S/N ratio corresponds to better performance characteristic, it can be seen that the factor-level combination [I1,Δ(1), I2,Δ(2), I3,Δ(3), I4,Δ(2), I5,Δ(2)] contributes to maximize the performance index. Since this combination does not exist in the original L18 orthogonal arrays (OAs), confirmation test should be conducted to verify the correctness of this optimization procedure
Summary
Secondary batteries are commonly utilized as energy storage solutions for modern technologies such as portable devices, renewable energy systems and electric vehicles. The lithium ion (Li-ion) battery has become most popular because it offers many advantages such as high power and energy density, high open circuit voltage, low self-discharge rate, low maintenance requirement and no memory effect. Recent trends show that Li-ion batteries are widely used in portable consumer electronics, but are gaining popularity for renewable energy, electric vehicle and military applications. Designing a high-quality battery charger is essential. The objectives of a high-quality charger include high charging efficiency, short charging time and prolonged cycle life [1,2,3,4,5]
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